Ive had the ML-350 for 4 weeks now with 1000 miles, performance is acceptable. I have been disappointed with the car. Few days after owning the vehicle, started the vehicle in garage, noticed two problems, 1. white smokes (only happened once). 2. Notice an engine knocks on cold start (listen carefully- make sure radio is off). Squeals noise coming from steering column and passenger driver. Drive Seat moves (under my knee) during acceleration. Rough idle. More wind noise than my Ford SUV.
Better quality build vehicle. Faster response from the HD (every time I switch to HD - a message comes on stating no service and last between 5- 10 seconds before voice comes on.